The short answer: yes, mostly — but not by themselves. Raised-heel trusses fix the one spot where every attic loses the fight, which is the few inches of ceiling directly over the exterior wall. Pair that heel with baffles, balanced venting, and an airtight ceiling plane and ice dams largely stop happening. Get the heel right and skip the other three and you'll still be chipping ice off the eaves in February.
What an ice dam actually is
An ice dam is a heat problem wearing a weather costume. Warm air leaks out of the living space into the attic, the underside of the roof deck warms up, snow on the middle of the roof melts, the water runs down to the eave — which is cold, because there's no heated room under it — and refreezes. The ridge of ice grows, backs water up under the shingles, and the homeowner finds it on the bedroom ceiling.
Nothing about that chain is solved by better shingles. It gets solved at the frame, and the decisions that matter get made when the trusses are designed, not when the insulator shows up.
Where a standard heel fails
A conventional truss sits on the top plate with roughly a 3 1/2-inch heel. Now run the numbers most Minnesota and North Dakota jobs are built to: the attic insulation target is deep enough that blown fiberglass runs somewhere in the range of 14 to 18 inches. Over the middle of the ceiling you have all the room in the world. At the wall, that pile gets wedged down to two or three inches as the roof plane closes in — and then a baffle takes another inch of it.
So the coldest, most exposed section of roof has the thinnest insulation underneath it, sitting right on top of the wall assembly where warm air is already trying to escape. That is exactly the recipe for a melt line at the eave. It is not a defect. It's geometry, and a standard heel guarantees it.
What a raised heel buys you
A raised or "energy" heel simply makes the truss taller where it lands on the wall — commonly 12 to 16 inches in our market. That height does three things at once:
- Carries full insulation depth all the way out over the exterior wall plate, so the eave runs cold and stays cold.
- Leaves clear room above the insulation for an honest vent channel instead of a pinched one.
- Gets the air-sealing details at the top plate out where a person can actually reach them.
The cost is real but modest, and it is mostly not the truss itself. You pay for a taller band of sheathing and siding around the building, taller gable ends, and occasionally a rethink of window head heights. The part people get wrong is the timing: heel height is a truss design decision. Changing it after the truss package is released means a redesign, a new lead time, and a schedule you didn't plan for. We raise it during shop drawing review, which is one of the reasons we push GCs to get us into the truss-versus-stick conversation early.
The framing details that have to go with it
The heel opens the door. These close the loop:
- Baffles in every bay, installed before insulation, stapled tight to the deck, and tall enough that blown insulation can't drift over the top of them.
- Balanced intake and exhaust. Continuous soffit intake paired with ridge exhaust, roughly matched. A ridge vent with starved soffits pulls its makeup air out of the house, which is the opposite of what you want.
- Eave blocking that doesn't choke the soffit. We block for wind wash and for the sheathing edge, not to seal the vent path shut.
- An airtight ceiling plane. Top plate penetrations, plumbing and duct chases, bath fan housings, recessed can boxes. Framing's job is to leave those chases accessible and blocked so they can be sealed before insulation buries them.
- Bath and kitchen fans ducted all the way out. A fan dumping into the attic is a snow-melting machine, and we still find them.
The one framers get blamed for
A perfectly vented attic with a wide-open plumbing chase running up from a heated bathroom will still dam. That chase is a chimney. It moves more heat into the attic than the entire ceiling does. When the callback comes, nobody remembers who framed the chase and who was supposed to seal it — so we block and label them, and we want that scope named in writing on the front end, the same way we handle snow load and drift details.
If the building already exists
Straight answer: you can't add heel height to a finished house without taking the roof off. What you can do is air-seal the attic floor hard, upgrade insulation at the eave with something that holds its R-value in a thin space, and make sure the soffits aren't packed solid. That combination fixes a lot of houses. It just costs more than doing it once, on paper, before the trusses were built.
Ordering trusses for a spring start? Send us the plans and we'll flag the heel and venting details before the package goes into production.